单项选择题

A．At 8:30.
B．At6:55.
C．At8:55.
D．At9:00.
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单项选择题
Rosa Parks was the first black person to refuse to give up a seat on the bus for a white person.
A．Y
B．N
C．NG
单项选择题
As a result of the limits Bush placed on stem cell research, American universities will________.
A．conduct the research in laboratories overseas
B．abandon the research altogether in the near future
C．have to carry out the research secretly
D．have to raise money to build separate labs
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